Rosie, a 24-year-old singer-songwriter, has built her career on her stripped-down sound — and her stripped-down approach to beauty. Her lyrics put her mental health journey on display, and she chooses not to wear makeup ever — for photo shoots, red carpets, or anything else. As part of PS’s Radical Honesty Issue, Rosie spoke to us about what going no makeup is really like. Read it all, in her own words, below. When I was 16 or 17 and I was really beginning to think about my career long-term, I knew that I wanted to make a difference in music, and I was still figuring out how to do that.…